linux/arch/arm/mach-socfpga/l2_cache.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * Copyright Altera Corporation (C) 2016. All rights reserved.
 */
#include <linux/io.h>
#include <linux/of_platform.h>
#include <linux/of_address.h>

#include "core.h"

/* A10 System Manager L2 ECC Control register */
#define A10_MPU_CTRL_L2_ECC_OFST          0x0
#define A10_MPU_CTRL_L2_ECC_EN            BIT(0)

/* A10 System Manager Global IRQ Mask register */
#define A10_SYSMGR_ECC_INTMASK_CLR_OFST   0x98
#define A10_SYSMGR_ECC_INTMASK_CLR_L2     BIT(0)

/* A10 System Manager L2 ECC IRQ Clear register */
#define A10_SYSMGR_MPU_CLEAR_L2_ECC_OFST  0xA8
#define A10_SYSMGR_MPU_CLEAR_L2_ECC       (BIT(31) | BIT(15))

void socfpga_init_l2_ecc(void)
{
	struct device_node *np;
	void __iomem *mapped_l2_edac_addr;

	np = of_find_compatible_node(NULL, NULL, "altr,socfpga-l2-ecc");
	if (!np) {
		pr_err("Unable to find socfpga-l2-ecc in dtb\n");
		return;
	}

	mapped_l2_edac_addr = of_iomap(np, 0);
	of_node_put(np);
	if (!mapped_l2_edac_addr) {
		pr_err("Unable to find L2 ECC mapping in dtb\n");
		return;
	}

	/* Enable ECC */
	writel(0x01, mapped_l2_edac_addr);
	iounmap(mapped_l2_edac_addr);
}

void socfpga_init_arria10_l2_ecc(void)
{
	struct device_node *np;
	void __iomem *mapped_l2_edac_addr;

	/* Find the L2 EDAC device tree node */
	np = of_find_compatible_node(NULL, NULL, "altr,socfpga-a10-l2-ecc");
	if (!np) {
		pr_err("Unable to find socfpga-a10-l2-ecc in dtb\n");
		return;
	}

	mapped_l2_edac_addr = of_iomap(np, 0);
	of_node_put(np);
	if (!mapped_l2_edac_addr) {
		pr_err("Unable to find L2 ECC mapping in dtb\n");
		return;
	}

	if (!sys_manager_base_addr) {
		pr_err("System Manager not mapped for L2 ECC\n");
		goto exit;
	}
	/* Clear any pending IRQs */
	writel(A10_SYSMGR_MPU_CLEAR_L2_ECC, (sys_manager_base_addr +
	       A10_SYSMGR_MPU_CLEAR_L2_ECC_OFST));
	/* Enable ECC */
	writel(A10_SYSMGR_ECC_INTMASK_CLR_L2, sys_manager_base_addr +
	       A10_SYSMGR_ECC_INTMASK_CLR_OFST);
	writel(A10_MPU_CTRL_L2_ECC_EN, mapped_l2_edac_addr +
	       A10_MPU_CTRL_L2_ECC_OFST);
exit:
	iounmap(mapped_l2_edac_addr);
}